Pupils lack basic maths skills, such as knowing how to multiply, in about two-fifths of primary schools and half of secondary schools in Wales. That's according the school's inspectorate, ESTYN, following inspections that were carried out between 2010-2012.
The report says that pupils cannot apply advanced numeracy skills because they are struggling with the basics. Some pupils struggle with decimals, fractions and percentages, such as understanding the relationships between 2/5ths, 0.4 and 40%.
Other aspects that need to be improved are the tracking and monitoring of pupils' progress. Only a minority of primary schools and a few secondary schools have effective systems to track pupils' progress in numeracy beyond their maths lessons.
More top news
The Ministry of Defence is 'urgently' looking for relatives of Sgt Roy Penry Williams from Glamorgan. He died in a bombing mission in WW2.
Organ transplant patients from Wales will be competing in the British Transplant Games in Newcastle as it gets underway today.
The Welsh Liberal Democrats announce plans to help first-time buyers on to the property ladder.